Verify that a specific file has been modified using python watchdog

Question

I would like to know how to check for changes to a specific file in a folder. I found that the watchdog module can check for changes to files in a folder, but I only need 1 file (with a fixed name).

Please help us with this and thanks.

class MyHandler(FileModifiedEvent):
    def on_modified(self, event):

if __name__ == "__main__":
        integrity_file_path = DATASTORE_DIRECTORY_PATH + '/schedule.xml'
        event_handler = MyHandler()
        observer = Observer()
        observer.schedule(MyHandler(), path=integrity_file_path,recursive=True)
        observer.start()

        try:
            while True:
                time.sleep(5)
        except KeyboardInterrupt:
            observer.stop()
        observer.join()

Answer 1

You can subclass the watchdog.events.PatternMatchingEventHandler event handler and modify it to do whatever you want in the event of an event. You must set the template as the name of the file you want to control.

. pathtools.patterns, . . , "" . , , .

:

import sys, os.path, time, logging
from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler


class MyEventHandler(PatternMatchingEventHandler):
    def on_moved(self, event):
        super(MyEventHandler, self).on_moved(event)
        logging.info("File %s was just moved" % event.src_path)

    def on_created(self, event):
        super(MyEventHandler, self).on_created(event)
        logging.info("File %s was just created" % event.src_path)

    def on_deleted(self, event):
        super(MyEventHandler, self).on_deleted(event)
        logging.info("File %s was just deleted" % event.src_path)

    def on_modified(self, event):
        super(MyEventHandler, self).on_modified(event)
        logging.info("File %s was just modified" % event.src_path)

def main(file_path=None):
    logging.basicConfig(level=logging.INFO,
        format='%(asctime)s - %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S')
    watched_dir = os.path.split(file_path)[0]
    print 'watched_dir = {watched_dir}'.format(watched_dir=watched_dir)
    patterns = [file_path]
    print 'patterns = {patterns}'.format(patterns=', '.join(patterns))
    event_handler = MyEventHandler(patterns=patterns)
    observer = Observer()
    observer.schedule(event_handler, watched_dir, recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()



if __name__ == "__main__":
    if len(sys.argv) > 1:
        path = sys.argv[1]
        main(file_path=path.strip())
    else:
        sys.exit(1)

watchdog python script ( ):

(stackoverflow)[[e-mail] stackoverflow]# python watchschedule.py /usr/local/src/stackoverflow/watchdog/schedule.xml
watched_dir = /usr/local/src/stackoverflow/watchdog
patterns = /usr/local/src/stackoverflow/watchdog/schedule.xml

schedule.xml :

[[e-mail] watchdog]# echo "I just modified this file" >> schedule.xml

schedule.xml:

(stackoverflow)[[e-mail] stackoverflow]# python watchschedule.py /usr/local/src/stackoverflow/watchdog/schedule.xml
watched_dir = /usr/local/src/stackoverflow/watchdog
patterns = /usr/local/src/stackoverflow/watchdog/schedule.xml
2015-08-31 19:30:31 - File /usr/local/src/stackoverflow/watchdog/schedule.xml was just modified

Answer 2

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